Melting pot discharge assembly for type casting machines



April 1941- J. "r. ROGERS 2.237.790

MELTING POT DISCHARGE ASSEMBLY FOR TYPE CASTING MACHINES Filed Feb. 28. 1940 a an" .m J\ is .31 .z/ j .20 v //////77/7' //y/}/\//7\I\\\\\\\\ I 25 -4 11 J 7, INVENTOR.

0 Phi BY J 7 j 1 as-d MGMQ ATTORNEYS.

Patented Apr. 8, 1941 ilCEL MELTING POT DISCHARGE ASSEMBLY F TYPE CASTING MACHINES Jay '1'. Rogers, Indianapolis, Ind.

Application February 28, 1940, Serial No. 321,162

1 Claim.

In many type casting machines, immediately preceding the present invention, the melting pot was provided with a two-diameter discharge bore, each of which was slightly tapered. Into the small diameter portion, of this bore was driven by a driving fit (to insure against metal leakage), a thimb-le, in the bore of which was reciprocably mounted, a valve, one portion of the wall of the sleeve being slotted to afford communication between the melting pot and the interior of the thimble, said valve coacting, in one position, with the mouth of the thimble, to shut 01f metal flow to the discharge nozzle. In the larger diameter outer end of the discharge bore was tightly driven a nozzle shell which enclosed the outer end of the valve and with which the valve, in one position, cooperated to cut off discharge of molten metal from the nozzle.

While such a nozzle structure is entirely satisfactory so long as the par-ts remain in normal condition, it was found, in practice, that, from time to time, replacements became necessary and removal of the driving fit nozzle shell and thimble was an exceedingly costly procedure.

The object of my present invention is to produce a discharge structure of the general character noted above, but so modified that, without sacrifice of tightness against leakage of hot metal, the several parts may be very readily removed, repaired, or replaced, by the average me- I chanic.

The accompanying drawing illustrates my invention:

Fig. 1 is anaxial section of one embodiment of my improvement; and

Fig. 2 a similar section of another embodiment.

In the drawing 10 indicates a fragment of the usual melting pot adjacent the discharge point thereof, said pot comprising a bottom H, side wall I2, and intermediate wall l3 which divides the pot into a main chamber l4 and a supplemental chamber IS. The outer wall l2 and intermediate wall 13 are provided with aligned bores IS, IS which provide a sliding fit for the thimble I! which is of usual construction except that its outer end is provided with an external flange l3 adapted to engage the outer surface of wall I2. This thimble I1 is provided with a cavity 20 which, at its open outer end, provides a valve seat 2! The wall of thimhle l! is pierced by a slot 22 which affords communication between chamber l5 and cavity 263. Reciprocably mounted in cavity 2!! is the usual valve 23 having a portion 24 seatable upon seat 2i and a portion 25, the purpose of which will appear. This valve is reciprocated axially by the usual finger 25 which is carried by a rock shaft forming part of the general machine. The wall of thimble ll is longitudinally pierced by a passage 21 which affords communication from chamber i i to the outer end of thimble l1 beyond seat 2!.

Sleeved over the outer end of valve 23 is a nozzle shell 30 provided with a mouth 3| into which part 25 of valve 23 maybe projected. The shell 30, at its inner end, engages the outer end of thimble I! and this shell is provided with an external circumferential shoulder 32.

In the form shown in Fig. 2, the other surface of wall l2 of the pot is provided with an externally threaded flange 33 surrounding flange E8 of thimble l1 and the inner end of nozzle shell 3%] and threaded onto this flange 33 is a clamping sleeve 34 provided with an internal shoulder adapted to engage shoulder 32 of the nozzle shell 39 thereby firmly clamping nozzle shell 3%] onto the outer end of thimble I! and clamping the flange ll! of said thimble upon the outer surface of the end wall l2 of the melting pot.

The form shown in Fig. 1 differs only in that the flange 33' is internally threaded to receive the clamping sleeve 34.

I claim as my invention:

A nozzle assembly for melting pots, comprising a melting pot having a wall perforated for the reception of a valve thimble, a valve thimble slidingly projected into said perforation and having an external flange engaging the outer face of the perforated pot wall, a nozzle shell, the inner end of which rests upon the outer end of the valve thimble and the outside of which is provided with a circumferential shoulder, and a clamping element having a shoulder oppositely associable with the nozzle shell shoulder, and means for associating said clamping element with the pot by a readily separable connection capable of firmly clamping the nozzle shell and valve thimble together upon the pot in a fluid-metal tight association.

JAY T. ROGERS. 

